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Deprecated: Implicit conversion from float 298.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2015 ; 6 (ä): 5914 Nephropedia Template TP
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Vasculopathy associated hyperangiotensinemia mobilizes hematopoietic stem cells/progenitors through endothelial AT2R and cytoskeletal dysregulation #MMPMID25574809
Chang KH; Nayak RC; Roy S; Perumbeti A; Wellendorf AM; Bezold KY; Pirman M; Hill SE; Starnes J; Loberg A; Zhou X; Inagami T; Zheng Y; Malik P; Cancelas JA
Nat Commun 2015[]; 6 (ä): 5914 PMID25574809show ga
Patients in organ failure of vascular origin have increased circulating hematopoietic stem cells and progenitors (HSC/P). Plasma levels of angiotensin II (Ang-II), are commonly increased in vasculopathies. Hyperangiotensinemia results in activation of a very distinct Ang-II receptor set, Rho-family GTPase members, and actin in bone marrow endothelial cells (BMEC) and HSC/P, which results in decreased membrane integrin activation in both BMEC and HSC/P, and in HSC/P de-adhesion and mobilization. The Ang-II effect can be reversed pharmacologically and genetically by inhibiting Ang-II production or signaling through BMEC AT2R, HSCP AT1R/AT2R or HSC/P RhoA, but not by interfering with other vascular tone mediators. Hyperangiotensinemia and high counts of circulating HSC/P seen in sickle cell disease (SCD) as a result of vascular damage, is significantly decreased by Ang-II inhibitors. Our data define for the first time the role of Ang-II HSC/P traffic regulation and redefine the hematopoietic consequences of anti-angiotensin therapy in SCD.